I work in helicopter maintenance, so reading this I was thinking, “yeah, and?”

It makes any task so much faster when you know exactly where the thing you need is.

The metallurgy is important, too, because different things corrode at different rates, and in contact with different metals.

Incidentally, that part in Big Hero 6 when Wasabi has his tools lined out, with every part and tool accounted for, I thought his shop area was well maintained and appropriate, especially working with such dangerous technology. Then they tried to portray him as mildly OCD or something, and I just thought everyone else was wrong. And Go-Go just grabbing a tool without checking it out was completely inappropriate and poor tool control.